基于模型试验的浅埋暗挖隧道施工过程中地表建筑物变形规律研究
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摘要
为研究城市浅埋暗挖隧道施工过程中地表建筑物的变形规律,通过物理模型试验并采用3D扫描对地表建筑物沉降进行监测,同时采用数字散斑技术(DIC)对建筑物模型墙体的应变进行监测,得到浅埋暗挖隧道施工过程中建筑物墙体的应变规律。研究结果表明:1)当建筑物中轴线与隧道中轴线平行,建筑物模型位于隧道正上方时,模型的各项应变随着与开挖掌子面距离的增大而减小; 2)建筑物模型受扭转产生的剪切应变主要受模型角点的不均匀沉降差值影响,不均匀沉降差值越大,受扭剪切应变越大; 3)建筑物模型受弯产生的拉伸应变和剪切应变主要受各角点沉降值的影响,沉降越大(即挠曲越大),产生的挠曲拉伸应变和剪切应变也越大。
The physical model test and 3 D scanning technology are used to monitor the settlement of surface buildings during construction of urban shallow-buried mined tunnel, and the digital image correlation(DIC) technology is used to monitor the strain of the building model wall to gain the strain law of the building wall during the construction of shallow-buried tunnel. The study results show that:(1) When the axial line of the building is parallel to the axial line of the tunnel and the building model is distributed directly above the tunnel, the strain of the building model decreases with the increase of the distance from the excavating face.(2) The shear strain induced by torsion in the building model is mainly affected by the uneven settlement difference of building model corner point; the larger the difference of uneven settlement, the greater the shear strain.(3) The tension-compression strain and shear strain produced by deflection of building model are affected by the settlement value of each corner point; the larger the settlement(deflection), the greater the flexural tension-compression strain and shear strain.
The physical model test and 3 D scanning technology are used to monitor the settlement of surface buildings during construction of urban shallow-buried mined tunnel, and the digital image correlation(DIC) technology is used to monitor the strain of the building model wall to gain the strain law of the building wall during the construction of shallow-buried tunnel. The study results show that:(1) When the axial line of the building is parallel to the axial line of the tunnel and the building model is distributed directly above the tunnel, the strain of the building model decreases with the increase of the distance from the excavating face.(2) The shear strain induced by torsion in the building model is mainly affected by the uneven settlement difference of building model corner point; the larger the difference of uneven settlement, the greater the shear strain.(3) The tension-compression strain and shear strain produced by deflection of building model are affected by the settlement value of each corner point; the larger the settlement(deflection), the greater the flexural tension-compression strain and shear strain.
引文
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[4] 李云屹,王昊,贡嘎顿珠,等.地下洞室开挖对地表建筑的影响[J].岩土工程学报,2017,39(增刊1):246.LI Yunyi,WANG Hao,Kunga-dondrob,et al.Influences of excavation of underground carvens on surface buildings[J].Chinese Journal of Geotechnical Engineering,2017,39(S1):246.
[5] PECK R B.Deep excavation and tunneling in soft ground[C]//Proceeding of 7th International Conference on Soil Mechanics and Foundation Engineering.Mexico City:[s.n.],1969:225.
[6] BURLAND J.Assessment of risk of damage to buildings due to tunneling and excavation[J].Earthquake Geotechnical Engineering,1995,3:1189.
[7] NAMAZI Eshagh,MOHAMAD Hisham.Assessment of building damage induced by three-dimensional ground movements[J].Journal of Geotechnical and Geoenvironmental Engineering,2013,139(4):608.
[8] BOONE S J.Ground-movement-related building damage[J].Journal of Geotechnical Engineering,1996,122(11):886.
[9] FU Jinyang,YANG Junsheng,YAN Li,et al.An analytical solution for deforming twin-parallel tunnels in an elastic half plane[J].International Journal for Numerical and Analytical Methods in Geomechanics,2015,39(5):524.
[10] SON M,CORDING E J.Estimation of building damage due to excavation-induced ground movements[J].Journal of Geotechnical and Geoenvironmental Engineering,2005,131(2):162.
[11] 张海波,殷宗泽,朱俊高.地铁隧道盾构法施工过程中地层变位的三维有限元模拟[J].岩石力学与工程学报,2005,24(5):755.ZHANG Haibo,YIN Zongze,ZHU Jungao.3D finite element simulation on deformation of soil mass during shield tunneling[J].Chinese Journal of Rock Mechanics and Engineering,2005,24(5):755.
[12] 杨海朋.施工过程中浅埋隧道自身性状及上部建筑物沉降变形的数值分析[D].长沙:湖南大学,2007.YANG Haipeng.Numerical study on behaviors of shallow tunnels and settlements of buildings in construction process[D].Changsha:Hunan University,2007.